Ethylene thiourea additive engineering for high-performance and stable lead-free Cu2AgBiI6 photodetectors
Lead-free bismuth-based halides, such as Cu2AgBiI6 (CABI), are promising candidates for environmentally friendly photodetectors, yet solution-processed films typically exhibit poor crystallinity, high defect density, and limited stability. Here, we demonstrate that ethylene thiourea (ETU) serves as a multifunctional ad...